Drastically reduce the number of redraws when editing content settings.

chrome/browser/resources/options/content_settings.js

Index: chrome/browser/resources/options/content_settings.js
diff --git a/chrome/browser/resources/options/content_settings.js b/chrome/browser/resources/options/content_settings.js
index a9a80bb3d56b5bccd526949fdd10e4d193501511..2b40cbf0ef700126295b68341a32d9dedb0c696e 100644
--- a/chrome/browser/resources/options/content_settings.js
+++ b/chrome/browser/resources/options/content_settings.js
@@ -98,11 +98,7 @@ cr.define('options', function() {
         document.querySelector('div[contentType=' + type + ']' +
                                ' list[mode=normal]');
 
-    exceptionsList.reset();
-    for (var i = 0; i < list.length; i++) {
-      exceptionsList.addException(list[i]);
-    }
-    exceptionsList.redraw();
+    exceptionsList.setExceptions(list);
   };
 
   ContentSettings.setOTRExceptions = function(type, list) {
@@ -111,12 +107,7 @@ cr.define('options', function() {
                                ' list[mode=otr]');
 
     exceptionsList.parentNode.classList.remove('hidden');
-
-    exceptionsList.reset();
-    for (var i = 0; i < list.length; i++) {
-      exceptionsList.addException(list[i]);
-    }
-    exceptionsList.redraw();
+    exceptionsList.setExceptions(list);
   };
 
   /**